1. Define Hydraulic
Denoting, relating to, or operated by a liquid moving in a confined space under pressure: "hydraulic fluid".

2.Define Pneumatic
Containing or operated by air or gas under pressure.

3.What Are Four Hydraulic Devices
1.Excavator
2.Hydraulic Hot Moulding Press
3.Triple Action Hydraulic Scrap Bailing Press
4.H Frame Hydraulic Press

4.What Are Four Pmeumatic Devices
1.Drill
2.Tires
3.Thermostats
4.Damper Motors

5.How Do Hydraulic Systems Work
The basic idea behind any hydraulic system is very simple: Force that is applied at one point is transmitted to another point using an incompressible fluid. The fluid is almost always an oil of some sort. The force is almost always multiplied in the process.

6.How Do Pneumatic Systems Work
A pneumatic system is any system that uses air pressure to move either a turbine or a cylinder to accomplish some work.

7.What Are The Main Differences Between Hydraulic And Pneumatic Systems?
One of the main differences between the two systems is that in pneumatics, air is compressible. In hydraulics, liquids are not.